public class MobileTelephone{
  SIM card;
  public void useSIM(SIM card){
   this.card=card;
}
  public void showMess(){
   System.out.println("使用的卡是:"+card.giveCorpName()+"提供的");
System.out.println("手机号码是:"+card.giveNumber());
  }
}
